US6925429B2 - Electric wiring simulation device and recording medium recording simulation program for electric wiring simulation device - Google Patents

Electric wiring simulation device and recording medium recording simulation program for electric wiring simulation device Download PDF

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US6925429B2
US6925429B2 US09/897,499 US89749901A US6925429B2 US 6925429 B2 US6925429 B2 US 6925429B2 US 89749901 A US89749901 A US 89749901A US 6925429 B2 US6925429 B2 US 6925429B2
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short
electric wiring
current
circuit
current value
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US20020004715A1 (en
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Yasuo Iimori
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Yazaki Corp
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Yazaki Corp
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/48—Analogue computers for specific processes, systems or devices, e.g. simulators
    • G06G7/62—Analogue computers for specific processes, systems or devices, e.g. simulators for electric systems or apparatus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/30—Circuit design
    • G06F30/36—Circuit design at the analogue level
    • G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/16—Cables, cable trees or wire harnesses

Definitions

  • the present invention relates to an electric wiring simulation device for simulating the characteristics of an electric wiring when the wiring is short-circuited.
  • the present invention particularly relates to an electric wiring simulation device capable of making a simulation as to whether or not the protecting part of an electric wiring is fused and whether or not the wiring smokes and a recording medium recording a simulation program for the electric wiring simulation device.
  • the conventional wire harness characteristics test will be described based on FIG. 1 .
  • a wire harness 101 serving as a test sample is connected to the positive terminal of a battery 102 serving as a power supply and a load terminal 103 which becomes a short-circuited region is connected to the negative terminal of the battery 102 through a knife switch 104 .
  • the knife switch 104 is turned on to short-circuit a circuit, a short-circuit current value at this time is obtained by a clamp ammeter 105 and measured by a memory HiCoder 106 . Time taken for a protecting pat 107 such as a fuse to be fused is also measured.
  • a wire harness serving as a sample is actually formed, actually short-circuited and a test is conducted to judge whether or not the protecting part is normally operated and fused or whether or not the wire harness smokes.
  • the present invention has been made under the above-described circumstances. It is, therefore, an object of the present invention to provide an electric wiring simulation device capable of making a simulation as to whether or not the protecting part of an electric wiring is fused and whether or not the wiring smokes and to provide a recording medium for recording a simulation program for the electric wiring simulation device.
  • the first aspect of the invention provides an electric wiring simulation device simulating characteristics of an electric wiring while the electric wiring is short-circuited, comprising: a characteristics information data base for storing parts information on parts and wirings constituting a test object circuit, discharge characteristics of a power supply, current-prearcing time characteristic of protecting parts and current-smoke time characteristics of the wirings; an assigned path searching unit for searching an assigned path between a short-circuit point and the power supply when the short-circuit point on the test object circuit is assigned; a current value calculating unit for calculating a resistance value on the assigned path searched by the assigned path searching unit, and calculating a short-circuit current value based on the resistance value and the discharge characteristics of the power supply; and a judging unit for judging whether each protecting pair on the test object circuit is fused and whether each wiring of the assigned path smokes based on the short-circuit current value calculated by the current value calculating unit, the current-smoke time characteristics and the current-prearcing time characteristics at unit time interval.
  • the first aspect of the invention it is possible to make a simulation as to whether or not the protecting part of an electric wiring is fused and whether or not the electric wiring smokes.
  • the second aspect of the invention provides an electric wiring simulation device according to the first aspect of the invention, wherein the current value calculating unit takes account of the resistance value during heat emission based on a change in the resistance values with respect to time, the resistance values included in the parts information.
  • the third aspect of the invention provides a recording medium for recording a simulation program for an electric wiring simulation device simulating characteristics of an electric wiring while the electric wiring is short-circuited, the simulation program recorded on the recording medium comprising: a storage process for storing parts information on parts and wirings constituting a test object circuit inputted as a simulation object, discharge characteristics of a power supply, current-prearcing time characteristics of protecting parts and current-smoking time characteristics of the wirings, in a data base; an assigned path searching process for searching an assigned path between a short-circuit point and the power supply when the short-circuit point is assigned on the test object circuit; a current value calculating process for calculating a resistance value on the assigned path searched in the assigned path searching processing, and for calculating a short-circuit current value based on the resistance value and the discharge characteristics of the power supply; and a judging process for judging whether each protecting part on the assigned path is fused and whether each wiring on the assigned path smokes based on the short-circuit current value calculated in the current
  • the third aspect of the invention it is possible to make a simulation as to whether or not the protecting part of an electric wiring is fused and whether or not the electric wiring smokes.
  • the fourth aspect of the invention provides a recording medium for recording a simulation program for an electric wiring simulation device simulating characteristics of an electric wiring according to the third aspect of the invention, wherein the current value calculating process is conducted while taking account of the resistance value during heat emission based on a change in the resistance values with respect to time, the resistance values included in the parts information.
  • the fifth aspect of the invention provides a simulation program for an electric wiring simulation device simulating characteristics of an electric wiring while the electric wiring is short-circuited, the simulation program comprising: a storage code segment for storing parts information on parts and wirings constituting a test object circuit inputted as a simulation object, discharge characteristics of a power supply, current-prearcing time characteristics of protecting parts and current-smoking time characteristics of the wirings, in a data base; an assigned path searching code segment for searching an assigned path between a short-circuit point and the power supply when the short-circuit point is assigned on the test object circuit; a current value calculating code segment for calculating a resistance value on the assigned path searched in the assigned path searching code segment, and for calculating a short-circuit current value based on the resistance value and the discharge characteristics of the power supply; and a judging code segment for judging whether each protecting part on the assigned path is fused and whether each wiring on the assigned path smokes based on the short-circuit current value calculated in the current value calculating code segment,
  • the fifth aspect of the invention it is possible to make a simulation as to whether or not the protecting part of an electric wiring is fused and whether or not the electric wiring smokes.
  • the sixth aspect of the invention provides a simulation program for an electric wiring simulation device simulating characteristics of an electric wiring while the electric wiring is short-circuited according to the fifth aspect of the invention, wherein the current value calculating code segment is conducted while taking account of the resistance value during heat emission based on a change in the resistance values with respect to time, the resistance values included in the parts information.
  • FIG. 1 is an explanatory view for a conventional wire harness short-circuit test
  • FIG. 2 is a block diagram showing the constitution of one embodiment of an electric wiring simulation device according to the present invention.
  • FIG. 3 is a flow chart for describing simulation process for the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 4 shows one example of an input screen for the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 5 shows one example of a part select screen for the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 6 shows one example of a parts information input screen for the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 7 shows one example of a wire data input screen for the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 8 shows one example of an input screen displaying a test object circuit for the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 9 is an explanatory view for the assignment of a plurality of short-circuit points for the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 10 shows one example of a screen displaying assigned path searching results for the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 11 shows one example of parts information stored in a characteristics information data base 4 shown in FIG. 2 ;
  • FIG. 12 shows one example of Current-prearcing time characteristics and current-smoke time characteristics stored in the characteristics information data base 4 shown in FIG. 2 ;
  • FIG. 13 shows one example of a simulation result display screen if the protecting circuit is fused, for a simulation made by the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 14 shows one example of a simulation result display screen if the wiring is burned, for a simulation made by the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 15 shows one example of a simulation result display screen if no trouble occurs, for a simulation made by the electric wiring simulation device 1 shown in FIG. 2 ;
  • FIG. 16 shows the results of a simulation conducted to a plurality of short-circuit points of the test object circuit.
  • the electric wiring simulation device 1 in this embodiment comprising an input device 2 inputting instructions from an operator responsible for an electric wiring simulation, a processing device 3 executing electric wiring simulation processes a characteristics information data base 4 storing information on respective parts and wirings necessary for the simulation processes, and a display 5 outputting simulation input screens and simulation results.
  • the processing device 3 includes an assigned path searching unit 11 searching an assigned path between a short-circuit point on a test object circuit inputted as a simulation object and a power supply when the operator assigns this short-circuit point, a current value calculating unit 12 calculating a resistance value on the searched assigned path, and calculating a short-circuit current value based on this resistance value and the discharge characteristics of the power supply, and a judging unit 13 judging whether or not each protecting part on the assigned path is fused and each wiring on the assigned path smokes based on this short-circuit resistance value, current-smoke time characteristics and current-prearcing time characteristics at unit time intervals.
  • the processing device 3 is constituted by an ordinary computer system including a CPU for conducting various processes and a storage unit storing instructions for the respective processes.
  • the instructions and timing restrictions for the respective processes conducted by the processing device 3 are held by the storage unit and loaded to and executed by the CPU as required.
  • the characteristics information data base 4 stores parts information on parts and wirings constituting the test object circuit, the discharge characteristics of the power supply such as a buttery, the current-prearcing time characteristics of the protecting parts such as a fuse and a fusible link and the current-smoke time characteristics of the respective wirings.
  • a simulation process conducted by the electric wiring simulation device will be described based on the flow chart of FIG. 3 .
  • the operation menu includes File (F), Part (P), circuit Bifurcation (B) and circuit Confluence (C), Wire (W), ET Cetera (ETC), Edition (E), Comprehensive Edition (CE) Function (FC), Image Processing (IP), Master Maintenance (MM), Reduced-size Display (RD) and Characteristics Display (CD).
  • An operator chooses parts used in a test object circuit and inputs the disposition of the parts so as to form the test calculation object (in a step S 202 ).
  • P 1 , P 2 , P 3 and the like are clicked on the operation menu on the input screen and parts are chosen from a select window shown in FIG. 5 .
  • the positions at which the parts are disposed are inputted by clicking on the positions on the input screen.
  • a select window for the part name and type of each part is displayed as shown in FIG. 6 and the part name and type thereof are inputted (in a step S 203 ).
  • Wirings are formed by clicking on ′W′ on the operation menu on the input screen and the parts are connected by the wirings (in a step S 204 ). Battery-side parts are clicked on from among the parts to be connected and then earth-side parts are clicked on. Then, the length, size, wire harness name and circuit code of each wire are inputted on a wire data input window shown in FIG. 7 .
  • test object circuit If the formation and setting of the test object circuit are completed as described above, a simulation for a short-circuited test object circuit is started.
  • a short-circuit part is assigned by clicking on the part to be short-circuited on the test object circuit displayed on the screen (in a step S 207 ).
  • the operator may input a plurality of short-circuit points in advance to allow the next short-circuit point to be automatically simulated instead of assigning only one short-circuit point. For example, in case of the test object circuit shown in FIG. 9 , the operator inputs short-circuit points numbered ⁇ circle around (1) ⁇ , ⁇ circle around (2) ⁇ , ⁇ circle around (3) ⁇ , . . . , automatically assigns the short-circuit points in this order and makes a simulation.
  • the assigned path is assumed as a assigned path 91 , displayed on the screen by discriminating the path 91 from the other paths and a short-circuit point 92 is indicated by an arrow (in a step S 208 ).
  • the initial resistance values of the parts and wirings on the assigned path are read by searching the parts information stored in the characteristics information data base 4 and the initial resistance value of the assigned path is calculated by obtaining the sum of these initial values (in a step S 209 ).
  • the parts information is information including the type, name, current capacity, initial resistance value and the like of each part.
  • FIG. 11 shows parts information On the fusible links.
  • the initial resistance value of the assigned path and the initial short-circuit current value of this assigned path are calculated based on the discharge characteristics of the battery stored in the characteristics information data base 4 (in a step S 210 ).
  • the discharge characteristics of the battery represents the voltage V of the battery after time 1 (sec).
  • the voltage after short circuit time 0 (sec) is read from this discharge characteristics, so that the initial short-circuit current value is calculated from the voltage thus read and the initial resistance value.
  • the initial resistance value and the initial short-circuit current value thus calculated are displayed on the window 93 shown in FIG. 10 . If the corrections of the initial values are necessary, corrected values are inputted on this window 93 to thereby correct the initial values (in a step S 211 ).
  • the initial value corrections are made to conform the values to data in a case where the electric wirings such as wire harnesses are actually mounted on a vehicle. For example, if it is known in advance that the short-circuit current value in the simulation data is lower than a short-circuit current value in a case where the electric wirings are actually mounted on the vehicle, the short-circuit current value in the simulation data is corrected in advance in view of the difference. Likewise, the initial resistance value is corrected.
  • simulation conditions are set (in a step S 212 ).
  • the conditions to be set include predetermined unit time for repenting the simulation and progress time for executing the simulation. Description will be given herein while assuming that the unit time is set at 0.1 (sec) and the progress time is set at 1800 (sec).
  • step S 213 it is judged whether or not the protecting parts of the test object circuit are fused in first 0.1 (sec) (in a step S 213 ).
  • step S 214 it is judged whether or not the wirings of the test object circuit are burned.
  • the judgments as to whether or not the protecting parts are fused and whether or not the wirings are burned are made based on the current-prearcing time characteristics and current-smoke time characteristics stored in the characteristics information data base 4 .
  • FIG. 12 shows one example of the current-prearcing time characteristics and the current-smoke time characteristics. The judgment as to whether or not each protecting part is fused and each wiring is burned will be described based on FIG. 12 . In FIG.
  • the horizontal axis indicates short-circuit current value and the vertical axis indicates time.
  • a curve S 1 indicated by a solid line shows the current-prearcing time characteristics of the protecting part rated 40 A, that is, the current-prearcing time is time for the protecting part to be fused with respect to the short-circuit current value.
  • a curve S 2 indicated by a dotted line shows the current-smoke time characteristics of the 124-sq wiring, that is, the current-smoke time is time for the wiring to smoke (or to be burned) with respect to the short-circuit current value.
  • the results of the simulation are displayed on the display 5 as shown in FIG. 13 , and if the wiring is burned, the results of the simulation are displayed on the display 5 as shown in FIG. 14 (in a step S 215 ).
  • the results of simulation include a fused or burned position, time for the protecting part to be fused or time for the wiring to be burned, a current value at that time and the like.
  • the short-circuit current value in the next unit time is calculated (in a step S 217 ) and the process after the step S 213 is repeated.
  • the short-circuit current value in the next unit time is obtained as follows. A discharge voltage after t (sec) is read from the discharge characteristics of the power supply stored in the characteristics information data base 4 . Furthermore, the resistance values of the respective parts and respective wirings after t (sec) are read from the part information. The short-circuit current value is calculated based on the voltage value and the resistance values. The resistance values after t (sec) are calculated in light of a change in respective part and wirings due to the heat emission of the parts and wirings, and the resistance values are stored in the characteristics information data base 4 as parts information.
  • the short-circuit current value is calculated in view of a change in resistance values if the respective parts and wirings are healed, whereby a simulation in view of a change in resistance values due to the heat emission of the wirings and parts can be made. If the progress time satisfies the set time in the step S 216 , the results of the simulations are displayed on the display 5 as shown in FIG. 15 (in the step S 215 ) and the simulation is completed.
  • the similar simulation can be automatically repeated while changing short-circuit points on one test object circuit and the results of these simulations can be collectively outputted in the form of a report as shown in FIG. 16 .
  • the electric wiring simulation device 1 in this embodiment it is possible to make a simulation as to whether or not the protecting parts of the electric wirings are fused and the wirings smoke without the need to actually form a prototype and to conduct a short-circuit test.
  • a program for realizing the respective processing steps of the above-described electric wiring simulation device can be stored in a storage medium.
  • the program can be executed and the respective processing steps of the above-described electric wiring simulation device can be realized while controlling the computer.
  • the recording medium is exemplified by a device, such as a memory device, a magnetic disk device or an optical disk device, capable of recording the program.

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Evolutionary Computation (AREA)
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  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
US09/897,499 2000-07-04 2001-07-03 Electric wiring simulation device and recording medium recording simulation program for electric wiring simulation device Expired - Lifetime US6925429B2 (en)

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JPP2000-202232 2000-07-04
JP2000202232A JP4177953B2 (ja) 2000-07-04 2000-07-04 電気配線シミュレーション装置及び電気配線シミュレーション装置におけるシミュレーションプログラムを記録した記録媒体

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JP4723887B2 (ja) * 2005-03-18 2011-07-13 三菱電機株式会社 ハーネス発熱量演算装置およびハーネス発熱量演算プログラム
KR100747323B1 (ko) 2005-11-28 2007-08-07 현대자동차주식회사 회로 단락 시험 해석 검증 방법
JP5348747B2 (ja) * 2008-12-25 2013-11-20 矢崎総業株式会社 電気配線解析装置、電気配線解析方法及びプログラム
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KR101714063B1 (ko) * 2011-05-12 2017-03-08 현대자동차주식회사 차량배선의 시뮬레이션 회로 생성방법 및 시스템
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JP4177953B2 (ja) 2008-11-05
US20020004715A1 (en) 2002-01-10

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